a 2595 series with a single handset but I´d tried several times to register but the message "please Register" still in the display. a 2595 series with a single handset but I´d tried several times to register but the message "please Register" still in the display.

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This sounds like a registration problem, each 'old'
handset must be de-registered from its original
base and then registered to the 'new' base.

NOTE: the CS6229 handles a maximum of 5
handsets. If you have a handset displaying
"Handset #5" then you have a 'fully populated system'
even if you actually have only one or two handsets.

You will need to clear each handset ( I ) then clear
the base of all registrations ( II ) before re-registering
each handset ( III ) up to the maximum of five.
=====================================
( I ). First, to de-register a handset ---

1. press [Find Handset] on the base and hold
past ~4 sec when the "In Use" lamp lights, at
about 10 secs the "In Use" lamp will begin to
blink.
2. release the [Find Handset] button momentarily,
then briefly press it again. After a moment,
all handsets that were registered to the base
(if any) will display "Not Registered" and be
ready for fresh registration
===============================

( III.) To register each handset to the base:

1. press [Find Handset] on the base and hold for
~4 sec until the "In Use" lamp lights.
2. press # on the handset and set the handset into
the handset cradle on the base
3. within 30 seconds or so, the handset will either
chirp and display "Handset Registered", then
"Handset #x" or it will say "Registration Failed".

NOTE: the battery must be well charged prior to the
registration process, a weak battery may cause a
"Registration Failed". Charge the battery for a
few hours and try the registration ( III ) again.

Registering a handset
If you see a "not registered" message on a handset,
you must register it to a base before using it.
1.
On the base, open the menu and select
Register Accy.
2.
On the handset, press and hold #/DND
until the handset display says
Handset Registering (about 2 seconds).
3.
Wait until the handset display says
Registration Complete (about 30 seconds),
then pick up the handset.
If you don't hear a dial tone or the display says
Registration Failed, charge the battery completely,
then try again.

This sounds like a registration problem. Try
de-registering the handset(s) and re-registering
to your base.

NOTE: the CS6429 handles a maximum of 5
handsets. If you have a handset displaying
"Handset #5" then you have a 'fully populated system'
even if you actually have only one or two handsets.

You will need to clear each handset ( I ) then clear
the base of all registrations ( II ) before re-registering
each handset ( III ) up to the maximum of five.
=====================================
( I ). First, to de-register a handset ---

1. press [Find Handset] on the base and hold
past ~4 sec when the "In Use" lamp lights, at
about 10 secs the "In Use" lamp will begin to
blink.
2. release the [Find Handset] button momentarily,
then briefly press it again. After a moment,
all handsets that were registered to the base
(if any) will display "Not Registered" and be
ready for fresh registration
===============================

( III.) To register each handset to the base:

1. press [Find Handset] on the base and hold for
~4 sec until the "In Use" lamp lights.
2. press # on the handset and set the handset into
the handset cradle on the base
3. within 30 seconds or so, the handset will either
chirp and display "Handset Registered", then
"Handset #x" or it will say "Registration Failed".

NOTE: the battery must be well charged prior to the
registration process, a weak battery may cause a
"Registration Failed". Charge the battery for a
few hours and try the registration ( III ) again.

When you reset a handset (or if you buy a new one1, that handset displays a Handset Not Registered message. If you see this message on a handset, you need to register it to a base before you can use it.
Registering a handset
Does the handset fit in the base cradle?
Yes
No
Place the handset in the base.
The display should say Handset Registering.
1. On the base, open the menu and select Register Handset. The display should say Handset Registering.
2. On the handset you want to register, press and hold # until the handset display says Handset Registering (about 2 seconds).
In about 30 seconds, the handset display should say Registration Complete. Press TALK ( )/FLASh and make sure you get a dial tone.
27
If...
Try...
- you don't hear a dial tone- the display says Registration Failed
Making sure the handset is fully charged, then start over at step 1.
To register a handset to a different base, see the section "Expanding Your phone" in the user's guide for the other base.

1) Press and hold END and # for at least five seconds.2) Move the cursor to select Base Unavailable and then press Menu/Select.3) Select the base which you want to de-register from, and then press Menu/Select. Base Unavailable appears.4) Move the cursor to select Yes, and then press Menu/Select. You hear a confirmation tone,

(For DCX150 handsets)5) Place the handset in the base cradle for about thirty seconds. Handset Registering will appear in the LCD.6) When the handset has registered to the base, the LCD will display Registration complete then show the handsetID number.If the display shows Registration failed, repeat the process again.

(For DCX200 or DCX300 handsets)5)Disconnect the base AC adapter. Then press and hold find while you reconnect the adapter. Keep holdingfind until the charge LED starts to blink.6)When charged, registered handsets display a handset ID number. Handsets that have not been registered display:7) On the handset, press and hold # until the handset beeps and displays Handset Registering.8) When the handset has registered to the base, the LCD will display Registration complete then show the handsetID number.If the display shows Registration failed, repeat the process again.

To register a DCX150 accessory handset:1. Charge the handset completely. 2.Place the handset in the base cradle for about thirty seconds. Handset Registering will appear in the LCD.3.When the handset has registered to the base, the LCD will display Registration complete then show the handset ID number.If the display shows Registration failed, repeat the process again.To register a DCX200 or DCX300 accessory handset:1.Charge the handset completely. 2.Disconnect the base AC adapter. Then press and hold find while you reconnect the adapter. Keep holding find until the charge LED starts to blink.3.On the handset, press and hold # until the handset beeps and displays Handset Registering.4.When the handset has registered to the base, the LCD will display Registration complete then show the handsetID number.If the display shows Registration failed, repeat the process again.Thanx

With the phone in standby, press MENU/SELECT on the base.
Move the cursor to select the Register Handset menu, and then press MENU/SELECT. Handset Registering will appear.
On the handset, press and hold # until the handset beeps and displays Handset Registering.
When the handset has registered to the base, the LCD will display Registration Complete then show the handset ID number.
If the display shows Registration failed, repeat the process again.
Note: If a handset has ever been registered to a base, reset the handset before you register it to a new base

I had a similar problem which I finally fixed. You did not say if any of your phones registered.
First try the following recommended by Uniden Support:
Your phone(s) should be fully charged before putting them on the main base.
Unplug the battery from the phone by removing the battery cover and removing the connector. Then, push the # and * key together and hold while you plug the battery back in (requires some dexterity). Continue to hold the two keys until you hear a confirmation tone. This will force the phone to reregister. Put the phone on the main base (if you are sure it has a fully charged battery) and see if it will reregister it to solve the problem.
That did not work for me. So, I followed the instructions to de-register the handset (even though it hadn't really registered). But, I also pretended like the Base was not available (because using the base in this step also failed).
1) Press and hold the hang up and # keys for at least 5 seconds.
2) Move the cursor to select Base Unavailable and then press Select.
3) Select the base you want to deregister from, press Select and then move the cursor to Yes and select.
This causes the phone to delete any of its base information.
At this point, again insure that your phone shows the battery is fully charged and if it is not, put it on the stand alone charger base (not the main base). With the battery fully charged, place it on the base and try registering again by placing it in the main base.
If neither of these approaches help, contact support at Uniden.com.
However, my problems were cleared when I cleared the handset with the second set of instructions.

One has to completely deregister all handset by pressing end and # keys together till complete de registration is shown on handset screen. if the de registration is not done as above stated method the hand set will not register will show connecting on hand set screen.